42 lines
1.0 KiB
Rust
42 lines
1.0 KiB
Rust
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Check that when we test the supertrait we ensure consistent use of
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// lifetime parameters. In this case, implementing T2<'a,'b> requires
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// an impl of T1<'a>, but we have an impl of T1<'b>.
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trait T1<'x> {
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fn x(&self) -> &'x int;
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}
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trait T2<'x, 'y> : T1<'x> {
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fn y(&self) -> &'y int;
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}
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struct S<'a, 'b> {
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a: &'a int,
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b: &'b int
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}
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impl<'a,'b> T1<'b> for S<'a, 'b> {
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fn x(&self) -> &'b int {
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self.b
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}
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}
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impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime
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fn y(&self) -> &'b int {
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self.b
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}
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}
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pub fn main() {
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}
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